31 lines
587 B
NASM
31 lines
587 B
NASM
SEG zeropageSegment
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ptrDstStart WORD
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ptrDstEnd WORD
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MACRO MEMSET
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SEG programSegment
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clc
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lda <{1}
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sta ptrDstStart
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adc <({3} + 1)
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sta ptrDstEnd
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lda >{1}
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sta ptrDstStart + 1
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adc >({3} + 1)
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sta ptrDstEnd + 1
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lda {2}
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ldy #0
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.loop:
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sta (ptrDstStart),y
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inc ptrDstStart
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bne .skipInc
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inc ptrDstStart + 1
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.skipInc:
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ldx ptrDstStart
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cpx ptrDstEnd
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bne .loop
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ldx ptrDstStart + 1
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cpx ptrDstEnd + 1
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bne .loop
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ENDM
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